[PATCH v4 0/3] Add vm_bind param check to ensure no overlap with kbo AS carveout

["Adrián Larumbe" <adrian.larumbe@collabora.com>]

Just a quick check to make sure user-supplied vm_bind regions aren't
clashing with the region reserved for kernel bo's.

I tried to introduce a similar check for panthor_vm_alloc_va(), to throw
back an error when mappings of kernel bo's against specific addresses fall
within the auto_va region. However that is not possible, since there's one
FW region that must be mapped right at CSF_MCU_SHARED_REGION_START. That
is usually not a problem, since drm_mm_insert_node_in_range() will pick
the next one available.

v3 also comes with an early bind range overflow check for sparse mappings.

Signed-off-by: Adrián Larumbe <adrian.larumbe@collabora.com>
---
Changes in v4:
- Deleted commit that passes single operation to panthor_vm_prepare_unmap_op_ctx.
- Moved overflow check one step above in the call stack.
- Rearranged the commits in the series.
- Link to v3: https://patch.msgid.link/20260629-vm_bind_checks-v3-0-85e6740f6c2e@collabora.com

Changes in v3:
- Fixed off-by-one error for user va range calculations.
- Added new commit for panthor_vm_prepare_unmap_op_ctx to take a whole operation.
- Added commit with bind range early overflow check.
- Link to v2: https://patch.msgid.link/20260619-vm_bind_checks-v2-0-b51abab35f71@collabora.com

Changes in v2:
- Simplified user VA range with kernel BO range overlap to a single statement.
- Link to v1: https://patch.msgid.link/20260616-vm_bind_checks-v1-0-956198602ae3@collabora.com

To: Boris Brezillon <boris.brezillon@collabora.com>
To: Steven Price <steven.price@arm.com>
To: Liviu Dudau <liviu.dudau@arm.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
To: Maxime Ripard <mripard@kernel.org>
To: Thomas Zimmermann <tzimmermann@suse.de>
To: David Airlie <airlied@gmail.com>
To: Simona Vetter <simona@ffwll.ch>
To: Heiko Stuebner <heiko@sntech.de>
To: Grant Likely <grant.likely@linaro.org>
To: Adrián Larumbe <adrian.larumbe@collabora.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org

---
Adrián Larumbe (3):
      drm/panthor: Check for sparse binding range overflow
      drm/panthor: Add vm_bind region with kbo range overlap check
      drm/panthor: Fix comment to reflect actual struct field name

 drivers/gpu/drm/panthor/panthor_mmu.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)
---
base-commit: 8fca3d8dbebf8d960dad7b10db3cb4a61139454b
change-id: 20260614-vm_bind_checks-46075ba069a0

Best regards,
--  
Adrián Larumbe <adrian.larumbe@collabora.com>